A small, lightweight and portable tritium air monitor

The Model 400AC is a compact and lightweight portable tritium in air monitor with several advanced features, including a gamma compensation on/off toggle switch for straightforward gamma calibration, NiMH rechargeable batteries, RS-232 data output, and automatic calibration software.  

With four 200cc ion chambers arranged in a cruciform geometry, the Model 400AC can ensure nearly perfect gamma compensation regardless of photon energy, flux gradient, or flux direction.  

Rechargeable b attery and adjustable alarm thresholds  

Powered by two “D” size NiMH rechargeable batteries, an LED indicator shows the onset of battery depletion. This LED will also turn red to signal a malfunction with the high voltage power supply.  

The front panel features a nine-position alarm level stepped attenuator, which can be adjusted over a range of 2 to 1,000 µCi/m3. If the measurement exceeds the alarm set-point, a steady tone is emitted and the red LED illuminates. Similarly, if the sample airflow is interrupted, the yellow LED lights up and the steady tone sounds. 

Drift-free with high sensitivity

Zero adjustment is unnecessary as the electrometer is temperature stable and exhibits zero drift from 0°C to 50°C. This stability is achieved through the careful selection of an ultra-high impedance semiconductor with low internal current leakage and long-term DC stability.  

The 400AC can reliably measure currents as low as 10-16 A, with permanently stable span calibration. The ionisation chamber polarising voltage is provided by an electronically regulated, low-noise dual high-voltage power supply (±80VDC). Additionally, the 400AC features proprietary radon recognition and elimination circuitry for accurate, fast, and drift-free measurements. 

Key Features

  • High performance portable tritium air monitor with upgraded features
  • Gamma compensation ON/OFF toggle switch for easy gamma source calibration
  • Automatic recalibration software
  • Cruciform gamma compensation (400cc volume) with virtually no offset in fields up to 10 mR/h
  • Sensitivity: 2 µCi/m3, 0.1 MBq/m3
  • Range: 1 to 19,999 µCi/m3 or 0.1 to 1,999.9 MBq/m3 (µSv/h also available)
  • Audible and visual alarm indicators for low flow, low battery, and signal level
  • High voltage power supply malfunction alarm
  • Alpha pulse suppression, radon rejection
  • RS-232 Data Output
  • No long-term drift, no manual zero adjustments
  • Offset potentiometer control included
  • CE Marked

Technical Specifications

Measurement Range  1 – 19,999 µCi/m3

Other available measurement ranges:
  •    0.1 to 1,999.9 MBq/m3 or DAC
  •    1 to 19,999 µSv/h
Sensitvity 2 µCi/m3 (0.1 MBq/m3)
Display 0 – 19,999 digits, LCD panel meter
Accuracy, Span ±10 % of reading, ±2 µCi /m3, whichever is greater
Noise Level ± 1μCi/m3, 1 S.D. (10 second electronic time constant)
Zero Stability after 30 seconds (or less) warm up, zero drift less than ± 1μCi/m3
Gamma Compensation Chambers in a side by side pattern reduce errors due to external gamma radiation
Alpha pulse suppression A circuit provides recognition and cancellation of undesirable noise spikes attributed to airborne radon
Response rate  30 seconds to reach 90% of final reading
Alarm (Acoustic)  1. Ten position stepped attenuator set point for signal alarm 2 – 1,000 μCi/m3, steady tone. OFF position is included.
2. Low flow produces an intermittent tone
3. Mute switch silences audible tone
Alarm (Visual) Signal level: red LED
Low flow: yellow LED, flashing
Low battery: red LED
HVPS: red LED illuminates to indicate a malfunction with the high voltage power supply (HVPS) used to bias the ionization chambers
External connections RS232 serial data output for tritium measurement, level alarm status and calibration
Ionisation chamber volume  Effective volume: 400 cm3 port to port volume: 440 cm3
Dust filter External in-line disposable cartridge type
Pump Internal rotary vane pump, flow rate: nominally 1.5 – 2 LPM
Environmental 0° C to +40° C, 20 – 90 % relative humidity non-condensing
Batteries Two “D” size NiMH batteries
External jack for supplementary power input and charging
Power converter 100-240 VAC, 50/60 Hz, .25 A to 3.3 Vdc @ 1.2 A
5.5 mm O.D. x 2.1 mm I.D. Plug, center pin is positive
Size and weight 7.6″ [193mm] L x 5.2″ [132mm] W x 6.9″ [175mm] H excluding handle, 6.5 lbs (3 kg)
Calibration  Automatic Calibration using pc-based software (included)
Manual Calibration by adjusting a calibration potentiometer
Accessories included • 2 “D” Size NiMH Batteries
• 2.3 meter DB9 cable for RS-232 serial data output
• Sniffer hose
• Dust filter
• AC Power converter
• Carrying case (optional)

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